Santi Cosma e Damiano was originally a Roman Catholic church affiliated with an Augustinian convent, it is now Greek Orthodox church.
Of the 12th-century Romanesque construction, only the bell-tower remains; the present facade and interiors mainly date to a reconstruction in the 18th century. The main altar (18th century) in polychrome marble has statues by Antonio Callegari and altarpiece by Giambettino Cignaroli and a 16th-century Ark of St Tiziano. Adjacent to the church is a 15th-century cloister. In 1923, at the instigation of a local poet Angelo Canossi, the names of the Italians who died in the war were inscribed in the columns.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.